Holley 350 jetting tuning help

Jimwell150

Active member
I have a 1967 200 with a holley 350 and dui. Was wondering what some of you guys run for jets and tuning etc. have a hard time getting the car to run right. It runs betweek 190 and 210 with a 180 thermostat in it. Also has a hesitation taking off from a stop.
 
Need all the information on your engine, thats what year head, direct mount carb, compression ratio, camshaft, transmission & rear ratio.
What pistons are you running-flat top, dished, deck height & cranking compression & exhaust system.
Part of the problem is the DUI settings & then we go from there.
 
You can try 59 main jets, but really the metering block needs to be modified with replaceable PVCR jets & change the location of the idle orifice.
What is the color of the accelerator pump cam on your carb??
Might need to richen the accelerator discharge nozzles to eliminate the hesitation.
Need to use a 8.5 power valve.
If you want the metering block modified PM me. Bill
 
What's the problem with the dui that I would have to change? Thought it was plug and play. Thinking of going back to a universal one barrel.
 
The DUI is a very good distributor. Fine tuning the centrifugal advance & vacuum advance to your application would be beneficial.
 
If you don't want to do the ignition, a stop gap is to drop down the Power Valve channel restrictions to 13.5 to 17 thou from the approx 59 thou they are now, and run a 6.5 Hg Holley power valve, or a 5.0 1983-1985 Mustang, or 5.8 Crown Victoria or 5.8 or 7.8 Liter F250 7.8 4180C two stage power valve.

You can then jet down to about 53.

This is what the Argentina Ford Falcon 2-bbl's ran.

But Bills way is better ans easier.
 
I have the orange cam in now not sure what jets are in it. Haven't taken the block off. Was wondering what someone with a stock 200 was running
 
Okay here you go:
Pump cam-pink on number 2 screw setting
Main jets- 65 plugs were white/gray (lean)
Accel-8.5

Now what should I try? Still isn't running well. Has hesitation and with a 160 theomstat still runs around 190
 
xctasy":10d3dexq said:
If you don't want to do the ignition, a stop gap is to drop down the Power Valve channel restrictions to 13.5 to 17 thou from the approx 59 thou they are now, and run a 6.5 Hg Holley power valve, or a 5.0 1983-1985 Mustang, or 5.8 Crown Victoria or 5.8 or 7.8 Liter F250 7.8 4180C two stage power valve.

You can then jet down to about 53.

This is what the Argentina Ford Falcon 2-bbl's ran.

But Bills way is better ans easier.


Amended post. Disregard the power valve recommendations, they were for a 125 to 132 hp 2 liter Pinto engine.

What I should have said is:-

Stock applications for a 350 2-bbl carb has the most fuel enrichment under the operation of the power valve of any Holley carb ever made, about 100%, as each power valve channel restriction is as big as the two stock carb jets. That carb was designed as a 289 to 390 cubic inch Autolite/ Motorcraft 2-bbl Ford V8 replacement carb.

To avoid lean out, its calibrated to go from fairly lean to psychotically rich when the power valve opens. Although it suits a 2v or Classic Inlines head with a good larger than stock cam without much alteration, or a a log head with an adapter is different.

If you don't want to do the ignition, a stop gap is to drop down the Power Valve channel restrictions to 40 thou from the approx 59 thou they are now, and run a 6.5 Hg Holley power valve, or a 5.0 1983-1985 Mustang, or 5.8 Crown Victoria or 5.8 or 7.8 Liter F250 7.8 4180C two stage power valve.

You can then jet down to about 53 call size jet

This is what the 2-bbl factory 221 cubic inch 350 Holley equipped cars used in South America/Argentina 1968 to 1983 SP 221's ran.

But Bills way is better and easier because his alterations are designed to suit the kind of set up you are using. His information has been constant, and gets constant results.
 
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